Go with the 150
Winds here in Boston & Cape Cod Bay are also light during the summer (not as light as you have, but still not like it is in Newport or the south shore of Long Island). I went with a 150 and never regretted it. Like the previous post said, you can always reef. I keep an old 100% as a backup in case I get caught out in a real blow, which is highly unlikely if you listen to the NOAA weather report before heading out.If you're still undecided about the 150, ask yourself this question: How many times was I concerned about having too much sail up vs how many times did I have to use the engine due to light winds when I'd rather have been sailing.That pretty much helped me make up my mind.Good luck,Allen Schweitzers/v FalstaffC-30 Hull# 632